package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

/**
 * @BelongsProject: hm-dianping
 * @BelongsPackage: com.hmdp.utils
 * @Author: 成希
 * @CreateTime: 2025-05-27  14:31
 * @Description: TODO
 * @Version: 1.0
 */
@Component
public class RedisIdWorker {
    /*
    * 开始时间戳
    * */
    public static final long BEGIN_TIMESTAMP = 1640995200L;
    /*
    * 序列号的位数
    * */
    public static final long COUNT_BITS = 32L;
    @Resource
    private StringRedisTemplate stringRedisTemplate;

    public Long nextId(String keyPrefix)
    {
        //1.生成时间戳
         LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timeStamp = nowSecond - BEGIN_TIMESTAMP;
        //2.生成序列号
        //2.1获取当前日期
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        Long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);

        //3.拼接并返回
        return timeStamp<<COUNT_BITS |count;
    }

    public static void main(String[] args) {
        LocalDateTime time=LocalDateTime.of(2022,1,1,0,0,0);
        long second = time.toEpochSecond(ZoneOffset.UTC);
        System.out.println(second);

    }
}
